那些遇到过的问题

在Jasmine测试中更新React组件状态

Ass*_*erg 12 javascript reactjs

我有一个相对简单的React组件,它根据其状态呈现列表.然后我有一个karma/jasmine测试,它会渲染组件,设置其状态,并检查是否呈现了正确的标记.

我遇到的问题是,每次我在我的组件上setState({})或forceUpdate()我的组件上,我都会收到错误:

TypeError: 'undefined' is not an object (evaluating 'deepestAncestor.firstChild')
        at /home/company/projects/user_interface_kit/bower_components/react/react.js:10314
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在React组件中测试状态更改的正确方法是什么？

反应代码:

    var NotificationCenter = React.createClass({

        getInitialState: function(){
            return {notifications:[]}
        },


        render: function() {            

                countContainerStyle = {
                    display: this.state.notifications.length > 0 ? '' : 'none'
                };


            return (
                <div id="pc-notification-center">
                    <span className="pc-notification-center-bell" >
                        B
                    </span>
                    <span className="pc-notification-count-container" style={countContainerStyle}>
                        <span className="pc-notification-count-circle">&#9679;</span>
                        <span className="pc-notification-count">{this.state.notifications.length}</span>
                    </span>
                </div>);
        }

    });

    return NotificationCenter;
});
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测试代码:

it('should set its notification count to the number of notifications it has', function() {
        var notificationCenter = NotificationCenter({}),
            countNode;

        TestUtils.renderIntoDocument(notificationCenter);

        notificationCenter.setState({
            notifications: [1,2]
        });


        countNode = TestUtils.findRenderedDOMComponentWithClass(notificationCenter,'pc-notification-count');


        expect(countNode).toBe(2);
    });
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编辑:完整堆栈跟踪

PhantomJS 1.9.7 (Linux) [object Object] [object Object] [object Object] should default its notification count to 0 FAILED
TypeError: 'undefined' is not an object (evaluating 'deepestAncestor.firstChild')
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:10314
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:10260
    at getNode (/home/company/projects/user_interface_kit/bower_components/react/react.js:9874)
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:4472
    at /home/company/projects/user_interface_kit/.tmp/notification_center/popover.js:28
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:5925
    at /home/company/projects/user_interface_kit/.tmp/notification_center/popover.js:75
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:5925
    at /home/company/projects/user_interface_kit/.tmp/notification_center/popover.js:81
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:10461
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:11924
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:13944
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:13877
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:4360
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:10055
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:11169
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:10105
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:11169
    at /home/company/projects/user_interface_kit/.tmp/notification_center/notification_center.js:50
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:10461
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:11924
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:13944
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:13877
    at /home/company/projects/user_interface_kit/bower_components/react/react.js:4360
    at /home/company/projects/user_interface_kit/bower_components/react/react-with-addons.js:10483
    at /home/company/projects/user_interface_kit/bower_components/react/react-with-addons.js:11597
    at /home/company/projects/user_interface_kit/bower_components/react/react-with-addons.js:10533
    at /home/company/projects/user_interface_kit/bower_components/react/react-with-addons.js:11597
    at /home/company/projects/user_interface_kit/bower_components/react/react-with-addons.js:12716
    at /home/company/projects/user_interface_kit/test/notification_center/notification_center_test.js:19
    at /home/company/projects/user_interface_kit/node_modules/karma-jasmine/lib/adapter.js:171
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1585
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:841
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1074
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:126
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1117
    at each (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:58)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1118
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:895
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1104
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:754
    at callGetModule (/home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1129)
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1479
    at /home/company/projects/user_interface_kit/node_modules/karma-requirejs/lib/require.js:1606
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这是一个重现问题的小项目 https://github.com/treehau5/react_karma_requirejs_bug_reproduction

小智 10

我不知道之前的答案是否仍然是真的.

使用React 0.11.1,此代码可以正常工作:

var React = require('react/addons');
var TestUtils = React.addons.TestUtils;

jest.dontMock('public/components/MyThing.jsx');
var MyThing = require('public/components/MyThing.jsx');

describe('MyThing', function() {
  var html;

  describe('#render', function() {
    beforeEach(function(){
      var component = MyThing();
      var componentInstance = TestUtils.renderIntoDocument(component);
      componentInstance.setState({isCool: true});

      html = componentInstance.getDOMNode().textContent;
    });

    it('includes something cool', function(){
      expect(html).toContain('something cool');
    });
  });
});
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